$$10\sqrt{7}-(5\sqrt{7})(3\sqrt{7})$$
$10\sqrt{7}-105\approx -78.542486889$
$$10\sqrt{7}-5\times 7\times 3$$
$$10\sqrt{7}-35\times 3$$
$$10\sqrt{7}-105$$
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$5 {(2 \sqrt{7} - 21)} = -78.542486889$
